Our customer indicated to us that this horizontal machining center spindle had experienced a crash. This global leader in the manufacturing of firearms has a large population of this machine model. They work closely with us in maintaining these spindles, sharing information and providing OEM parts which we are unfortunately prohibited from obtaining directly.
As is so often the case, the oil mist lubricated front bearing set was contaminated with a thick brown sludge. We noted that the tooling taper and coolant plunger assemblies had been damaged in the crash. We assumed that this was also true of the tool gripper fingers (collet), as they were not present in the spindle incoming. Our customer did however provide a new set of OEM grippers and Bellevilles. We have found that unlike the majority of makes and models we rebuild, this particular Mori Seiki spindle model requires a set of OEM Bellevilles to supply the correct tool retention force. Our full dimensional evaluation of the bearing journals, shoulders, and housing bores did not reveal any other significant deviations.
We performed a kiss grind of the tooling taper ID and face, and rebuilt the spindle with new ceramic hybrid bearings, o-rings and assembly screws. We used the customer-supplied OEM parts to rebuild the drawbar assembly. Our customer has a practice of replacing the OEM coolant plunger assemblies themselves after the spindle is returned to them. Before we had completed the final test run, break-in and final QC, our customer had already shipped us another spindle for disassembly, evaluation, quoting and rebuild.
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Mori Seiki has been a mainstay in the machine tool world since 1948. They are known for quality and reliability. Mori Seiki spindles share the same qualities as the Mori Seiki machine. Mori Seiki spin [...]
Our customer informed us prior to sending in this modern horizontal milling spindle that they were experiencing high runout, likely due to a crash. We… [...]
12,000 rpm We repair several spindles from our customers in Canada. This spindle came to us in very rough shape. The spindle had a damaged shaft taper, broken drive dogs, coolant plungers were [...]
Possible cause of failure: Shaft taper is worn, tooling rocks in the taper. Drawbar force is 1420lbs incoming (low for a Big Plus taper), likely from being taper ground. Taper coolant plungers [...]
Mori Seiki NH5000 Spindle Rebuild Possible cause of failure: First and second bearings failed. The number two bearing spun on the shaft and in the housing. Shield for the oil line was snapped off. [...]
Our customer reported to us they were sending in a tailstock from a Mori Seiki NL-3000. They had galled the taper and needed it fixed… [...]
I really didn’t expect this; You guys really pulled it off! My many thanks to Sandy, Louis and your outstanding crew for helping us get back into production.
Lou all in all everything is running good. Just had a call from Sandy just the other day, its funny great minds think alike. Its great not to be sending spindles out on a regular basis since you addressed my problems, but I know they will still be coming sooner or later. Never a problem when we get them back , run better than new. Hope everything is ok there. Please tell everyone there that we here appreciate everything that you do to keep us up and running and the quick turnarounds. Have delt with the rest now deal with the best. Have a great week end and up and coming holiday.
Thank you Debbie just received spindle today and WOW ! what a nice job. Can’t wait to use it. Thank the Northland team for us for a job well done
Both of the spindles that you repaired are on the machines and running great. We don’t have any spares for those grinders. We probably will not be purchasing a spare, as you have been able to turn around the repairs quickly and the price of a spare is cost prohibitive.
I am writing to thank Northland Tool for going the extra mile and saving my company from expensive machine downtime and expensive repairs. We have always sent our Chiron spindles for repair as a shaft with bearings. None of our previous rebuilders pointed out the bearing fretting or the fact that the housing in the machine was out of tolerance and causing premature failure to the spindles. After Northland fixed the housings the spindles have never sounded as good or run as well! Great job guys!
The detailed cause of failure reports and the expert technical advice that Northland Tool provides is bar none the best I have ever seen. We struggled to keep two of our large our milling spindles running for longer than 6 to 12 months. Northland Tools evaluation showed that the hydraulic nuts were not holding the assembly together causing premature spindle failure. We discussed this in detail and mutually decided to modify the spindle shaft to prevent this from occurring again. The first spindle we performed this on is still in the machine running like new after 3 years. That’s over three times the life of previous repairs and it’s still going strong. Easily over $40,000.00 of savings so far on that one machine and counting.
Your people go above and beyond the call of duty when it comes to spindle repair. When we had difficulty with the spindle installation and we were able to talk directly to a spindle technician that helped us troubleshoot the issue it helped us out of a bind. We have sent several spindles to you and have nothing but great things to say.
Thank you for your attention with my quick turn spindle repair. Your status updates allowed me to plan around machine downtime and I now know that you deliver on your promises. In the past other spindle repair vendors talked a big game and consistently failed to deliver. You not only delivered my spindle before the due date but you kept me informed throughout the entire repair process.
You performed a miracle with my BIG PLUS spindle. After crashing the spindle severely damaging the taper we found that a replacement spindle was not only cost prohibitive but had a long delivery. Your repair was a fraction of the cost of new and you never would know that the spindle was damaged to the extent it was.
Catastrophic bearing failure was the main cause of this spindle malfunction
Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication…